hand 1
Can he pay me with weaker hands?
- being against 80/16 player, answer is yes

Would he bet a 3 on the end?
- I think if he c/c flop and turn he would mostly also c/c river with 3x.
But at the same time he would call you down so many worse hands, so it should be shove on the river

Hand2
This should be only a call since str and flush is possible. But wouldn't he go allin with such a strong hand?
- I would personally prefer call there, since I wouldn´t shove there if he would checked to me. With two pair or set I´d put him all-in, but here I´d just call

Hand3
Prefer b/c 8$. He would call me down with worse hands+ sometimes might shove with worse hands. Also I think river potsize shove isn´t bad but that might get called fever times by worse hands